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Portable USB  
LEDs, or light-emitting diodes, are a form of solid-state lighting that is extremely efficient and long-lasting. While incandescent and fluorescent lights consist of filaments in glass bulbs or bulbs that contain gases, LEDs consist of small capsules or lenses in which tiny chips are placed on heat-conducting material.  
 
Size and Efficiency
LEDs measure from 3 to 8 mm long and can be used singly or as part of an array. The small size and low profile of LEDs allow them to be used in spaces that are too small for other lightbulbs. In addition, because LEDs give off light in a specific direction, they are more efficient in application than incandescent and fluorescent bulbs, which waste energy by emitting light in all directions.  
 
Long Life
The life of a high-power white LED is projected to be from 35,000 to 50,000 hours, compared to 750 to 2,000 hours for an incandescent bulb, 8,000 to 10,000 hours for a compact fluorescent and 20,000 to 30,000 hours for a linear fluorescent bulb. LED lifetimes are rated differently than conventional lights, which go out when the filament breaks. Typical lifetime is defined as the average number of hours until light falls to 70 percent of initial brightness, in lumens. LEDs typically just fade gradually.  
 
Lower Temperatures
Conventional lightbulbs waste most of their energy as heat. For example, an incandescent bulb gives off 90 percent of its energy as heat, while a compact fluorescent bulb wastes 80 percent as heat. LEDs remain cool. In addition, since they contain no glass components, they are not vulnerable to vibration or breakage like conventional bulbs. LEDs are thus better suited for use in areas like sports facilities and high-crime locations.  
 
EnergyStar LEDs
Poorly designed LEDs may not be long-lasting or efficient. LEDs that are EnergyStar-qualified should provide stable light output over their projected lifetime. The light should be of excellent color, with a brightness at least as great as conventional light sources and efficiency at least as great as fluorescent lighting. The LEDs should also light up instantly when turned on, should not flicker when dimmed and should not consume any power when turned off.  
 
The Onite 5W Portable USB LED Bulb is definitely unique, yet fascinating. What I love about this is rather than using electricity or batteries, you`re using a USB port. For now I have mine plugged into my desk top and rigged above my desk as a little desk light and it works great. The bulb provides plenty of light. Power outage? Rather than plugging into your desktop plug it into a power bank or even a fully charged laptop - anything with a USB port to get it to work. Once plugged in, just click the switch to turn it off. It`s that simple. Nothing special, nothing fancy, just a unique light that`s definitely neat to have around. It even has a convenient metal wire hook for portable to hang on or take down anytime. As simple as this is, I am honestly impressed with it. If you do choose to hang the light bulb up somewhere I`d recommend getting some wire clips to help make a neat and clean hanging rather than the wire hanging all over. 
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